如何使用 VB.NET 将十六进制转换为十进制？

Question

我需要在VB.NET中将十六进制转换为十进制。 在 C# 中找到了几个示例，但是当我尝试转换为 VB.NET 时，我没有成功。 我尝试转换的十六进制数的一个示例是“A14152464C203230304232323020572F544947455234352E”。

Answer 1

对于实际上不需要使用 bignum 类的十六进制值，您可以使用正常的转换函数，但在数字前加上“&H”。 VB 将文本中的“&H”解释为“这是一个十六进制数”，就像它在代码中所做的那样。

dim n = Cint("&H" & text)

Answer 2

那是一个 24 字节（192 位）的数字； 你期望什么价值？

请注意，您可以在此处使用Convert来做很多繁琐的工作 - 例如（在 C# 中）：

    string hex = "A14152464C203230304232323020572F544947455234352E";
    byte[] raw = new byte[hex.Length / 2];
    for (int i = 0; i < raw.Length ; i++)
    {
        raw[i] = Convert.ToByte(hex.Substring(i * 2,2), 16);
    }

你如何从raw到一个数字取决于你认为这个数字是什么......

.NET Reflector提供的 Visual Basic 翻译（尽管“-1”看起来很奇怪）：

Dim hex As String = "A14152464C203230304232323020572F544947455234352E"
Dim raw As Byte() = New Byte((hex.Length / 2)  - 1) {}
Dim i As Integer
For i = 0 To raw.Length - 1
    raw(i) = Convert.ToByte(hex.Substring((i * 2), 2), &H10)
Next i

Answer 3

您可以使用 Visual Basic 中的Val函数将十六进制值转换为十进制值。 这是通过在字符串前面加上"&H"来完成的，告诉 Visual Basic 这是一个十六进制值，然后将其转换为数字。

Dim Value As Integer = Val("&H" & YourHexadecimalStringHere)

Answer 4

尝试了其他回复，这是对我有用的回复：

    Convert.ToInt32(yourHEXString, 16)

文档

Answer 5

自己写一个。

您将需要对字符串进行标记，然后从右侧开始，然后向左工作。

int weight = 1;
While Looping
{

  If (token(i) == "F") { DecimalValue += 15 * weight; }
  If (token(i) == "E") { DecimalValue += 14 * weight; }
  If (token(i) == "D") { DecimalValue += 13 * weight; }
  If (token(i) == "C") { DecimalValue += 12 * weight; }
  If (token(i) == "B") { DecimalValue += 11 * weight; }
  If (token(i) == "A") { DecimalValue += 10 * weight; }
  else { DecimalValue += token(i) * weight; }

  weight = weight * 16;
}

类似的东西。

Answer 6

    Dim hex As String
    hex = "A14152464C203230304232323020572F544947455234352E"

    Dim dec As Long
    Dim hexpart As String
    For x As Integer = 1 To (hex.Length / 2)

        hexpart = hex.Substring((x * 2) - 2, 2)
        dec = Int32.Parse(hexpart, System.Globalization.NumberStyles.HexNumber)

        Debug.Print("Hex = " + hex + ",HexPart = " + hexpart + ", Dec = " + dec.ToString + Environment.NewLine)
    Next

这对十进制不起作用，十六进制对于整数来说太长了……但你明白了。 您可以将其拆分并重新组合。

Hex = A14152464C203230304232323020572F544947455234352E,HexPart = A1, Dec = 161
Hex = A14152464C203230304232323020572F544947455234352E,HexPart = 41, Dec = 65
Hex = A14152464C203230304232323020572F544947455234352E,HexPart = 52, Dec = 82
Hex = A14152464C203230304232323020572F544947455234352E,HexPart = 46, Dec = 70
Hex = A14152464C203230304232323020572F544947455234352E,HexPart = 4C, Dec = 76
Hex = A14152464C203230304232323020572F544947455234352E,HexPart = 20, Dec = 32
Hex = A14152464C203230304232323020572F544947455234352E,HexPart = 32, Dec = 50
Hex = A14152464C203230304232323020572F544947455234352E,HexPart = 30, Dec = 48
Hex = A14152464C203230304232323020572F544947455234352E,HexPart = 30, Dec = 48
Hex = A14152464C203230304232323020572F544947455234352E,HexPart = 42, Dec = 66
Hex = A14152464C203230304232323020572F544947455234352E,HexPart = 32, Dec = 50
Hex = A14152464C203230304232323020572F544947455234352E,HexPart = 32, Dec = 50
Hex = A14152464C203230304232323020572F544947455234352E,HexPart = 30, Dec = 48
Hex = A14152464C203230304232323020572F544947455234352E,HexPart = 20, Dec = 32
Hex = A14152464C203230304232323020572F544947455234352E,HexPart = 57, Dec = 87
Hex = A14152464C203230304232323020572F544947455234352E,HexPart = 2F, Dec = 47
Hex = A14152464C203230304232323020572F544947455234352E,HexPart = 54, Dec = 84
Hex = A14152464C203230304232323020572F544947455234352E,HexPart = 49, Dec = 73
Hex = A14152464C203230304232323020572F544947455234352E,HexPart = 47, Dec = 71

Answer 7

这会将您的字符串转换为字节数组：

Dim hex As String = "A14152464C203230304232323020572F544947455234352E"

Dim len As Integer = hex.Length \ 2
Dim data(len - 1) As Byte
For i As Integer = 0 to len - 1
   data(i) = Convert.ToByte(hex.Substring(i * 2, 2), 16)
Next

Answer 8

Private Function toByte(ByVal Shex As String) As List(Of Byte)
    Const cvtCH As Integer = 2
    Dim retval As New List(Of Byte)
    Dim rmndr As Integer
    rmndr = Shex.Length Mod cvtCH
    If rmndr <> 0 Then Shex = Shex.PadLeft(Shex.Length + cvtCH - rmndr, "0"c)
    For x As Integer = 0 To Shex.Length - 1 Step cvtCH
        retval.Add(Convert.ToByte(Shex.Substring(x, cvtCH), 16))
    Next
    Return retval
End Function
Private Function toU32(ByVal Shex As String) As List(Of UInt32)
    Const cvtCH As Integer = 8
    Dim retval As New List(Of UInt32)
    Dim rmndr As Integer
    rmndr = Shex.Length Mod cvtCH
    If rmndr <> 0 Then Shex = Shex.PadLeft(Shex.Length + cvtCH - rmndr, "0"c)
    For x As Integer = 0 To Shex.Length - 1 Step cvtCH
        retval.Add(Convert.ToUInt32(Shex.Substring(x, cvtCH), 16))
    Next
    Return retval
End Function
Private Function toU64(ByVal Shex As String) As List(Of UInt64)
    Const cvtCH As Integer = 16
    Dim retval As New List(Of UInt64)
    Dim rmndr As Integer
    rmndr = Shex.Length Mod cvtCH
    If rmndr <> 0 Then Shex = Shex.PadLeft(Shex.Length + cvtCH - rmndr, "0"c)
    For x As Integer = 0 To Shex.Length - 1 Step cvtCH
        retval.Add(Convert.ToUInt64(Shex.Substring(x, cvtCH), 16))
    Next
    Return retval
End Function
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    'unsigned 32 bit max = FFFFFFFF
    'unsigned 64 bit max = FFFFFFFF
    'signed 32 bit max = 7FFFFFFF
    'signed 64 bit max = 7FFFFFFF
    Dim hexS As String = "A14152464C203230304232323020572F544947455234352E"
    Dim hexS2 As String = "A14152464C203230304232323020572F54494745523435"
    toByte(hexS)
    toU32(hexS)
    toU64(hexS)
End Sub

Answer 9

Dim hex As String = "A1B2C3D4"
Dim int As Integer = Val("&H" & hex)